Add multi-account support

- Schema: account_id FK on checks and layout_fields; UNIQUE per-account on check_no and field_name
- DB: runtime migration recreates both tables to add account_id (assigns existing rows to account 1)
- Routes: GET /api/accounts lists all; GET /api/account/:id replaces hardcoded id=1; POST /api/account/setup always creates a new account and returns accountId
- checks.js: all queries scoped by account_id; POST requires account_id in body
- pdf.js: resolves account from check's account_id instead of id=1; layout fields fetched per-account
- import-mdb.js: always INSERTs a new account (never deletes existing); all records tagged with new accountId
- Frontend: account switcher in header; activeAccountId persisted to localStorage; all API calls pass account_id; switching accounts reloads checks; wizard and import auto-switch to newly created account

src/db/database.js

@@ -7,7 +7,6 @@ const path = require('path');
 const DB_PATH = process.env.DB_PATH || path.join(__dirname, '../../data/ezcheck.db');
 const SCHEMA_PATH = path.join(__dirname, 'schema.sql');
 
-// Ensure data directory exists
 const dataDir = path.dirname(DB_PATH);
 if (!fs.existsSync(dataDir)) {
   fs.mkdirSync(dataDir, { recursive: true });
@@ -15,7 +14,6 @@ if (!fs.existsSync(dataDir)) {
 
 const db = new Database(DB_PATH);
 
-// Enable WAL mode for better concurrent read performance
 db.pragma('journal_mode = WAL');
 db.pragma('foreign_keys = ON');
 
@@ -23,4 +21,76 @@ db.pragma('foreign_keys = ON');
 const schema = fs.readFileSync(SCHEMA_PATH, 'utf8');
 db.exec(schema);
 
+// --- Runtime migrations for schema upgrades ---
+
+// Migration: add account_id to checks, fix UNIQUE to be per-account
+const checksInfo = db.prepare('PRAGMA table_info(checks)').all();
+if (!checksInfo.some(c => c.name === 'account_id')) {
+  db.exec(`
+    ALTER TABLE checks RENAME TO checks_old;
+    CREATE TABLE checks (
+      id             INTEGER PRIMARY KEY AUTOINCREMENT,
+      account_id     INTEGER NOT NULL DEFAULT 1 REFERENCES account(id),
+      check_no       INTEGER NOT NULL,
+      payee          TEXT NOT NULL,
+      amount         REAL NOT NULL,
+      check_date     TEXT NOT NULL,
+      memo           TEXT,
+      note1          TEXT,
+      note2          TEXT,
+      payee_address1 TEXT,
+      payee_address2 TEXT,
+      payee_address3 TEXT,
+      payee_address4 TEXT,
+      printed        INTEGER NOT NULL DEFAULT 0,
+      add_date       TEXT NOT NULL DEFAULT (datetime('now')),
+      mdb_check_id   INTEGER,
+      UNIQUE(account_id, check_no)
+    );
+    INSERT INTO checks (id, account_id, check_no, payee, amount, check_date, memo, note1, note2,
+      payee_address1, payee_address2, payee_address3, payee_address4, printed, add_date, mdb_check_id)
+    SELECT id, 1, check_no, payee, amount, check_date, memo, note1, note2,
+      payee_address1, payee_address2, payee_address3, payee_address4, printed, add_date, mdb_check_id
+    FROM checks_old;
+    DROP TABLE checks_old;
+    CREATE INDEX IF NOT EXISTS idx_checks_date     ON checks(check_date);
+    CREATE INDEX IF NOT EXISTS idx_checks_printed  ON checks(printed);
+    CREATE INDEX IF NOT EXISTS idx_checks_check_no ON checks(check_no);
+    CREATE INDEX IF NOT EXISTS idx_checks_account  ON checks(account_id);
+  `);
+}
+
+// Migration: add account_id to layout_fields, change UNIQUE to per-account
+const lfInfo = db.prepare('PRAGMA table_info(layout_fields)').all();
+if (!lfInfo.some(c => c.name === 'account_id')) {
+  db.exec(`
+    ALTER TABLE layout_fields RENAME TO layout_fields_old;
+    CREATE TABLE layout_fields (
+      id               INTEGER PRIMARY KEY AUTOINCREMENT,
+      account_id       INTEGER NOT NULL DEFAULT 1 REFERENCES account(id),
+      field_name       TEXT NOT NULL,
+      field_text       TEXT,
+      font_name        TEXT NOT NULL DEFAULT 'Helvetica',
+      font_size        REAL NOT NULL DEFAULT 10,
+      font_bold        INTEGER NOT NULL DEFAULT 0,
+      field_type       TEXT NOT NULL DEFAULT 'Regular',
+      line_thick       INTEGER NOT NULL DEFAULT 1,
+      x_pos            REAL NOT NULL DEFAULT 0,
+      y_pos            REAL NOT NULL DEFAULT 0,
+      x_end_pos        REAL NOT NULL DEFAULT 0,
+      y_end_pos        REAL NOT NULL DEFAULT 0,
+      visible          INTEGER NOT NULL DEFAULT 1,
+      not_for_preprint INTEGER NOT NULL DEFAULT 0,
+      UNIQUE(account_id, field_name)
+    );
+    INSERT INTO layout_fields (id, account_id, field_name, field_text, font_name, font_size, font_bold,
+      field_type, line_thick, x_pos, y_pos, x_end_pos, y_end_pos, visible, not_for_preprint)
+    SELECT id, 1, field_name, field_text, font_name, font_size, font_bold,
+      field_type, line_thick, x_pos, y_pos, x_end_pos, y_end_pos, visible, not_for_preprint
+    FROM layout_fields_old;
+    DROP TABLE layout_fields_old;
+    CREATE INDEX IF NOT EXISTS idx_layout_account ON layout_fields(account_id);
+  `);
+}
+
 module.exports = db;